87 GT, MAF conversion... car revvs to 3000 on startup?

[Boss 351]

Hi, I got a call from a guy (he's real discouraged, no one can find the problem).

It's an 87GT with a B303 cam and a MAF conversion. I think the MAF conversion isn't well done because the vacuum line to the MAP is still plugged in (shouldn't I replace the MAP to BAP? The online instructions says to just remove the vacuum line and leave the MAP sensor in place). I will check to see if the MAF is properly plugged in and such...

Another thing that eludes me is that the idle air bypass solenoid wiring has been played with. I unplugged the solenoid and the car won't revv to 3000 on startup and will actually idle. So I bet the solenoid gets a wicked signal and is wide open for too long.

Also you think I should install an idle adjuster (between the TB and IAP solenoid)?

Thanks for any ideas you guys might have...

 

[jrichker]

Thjere are a number of things that can cause the RPM to hang high.
This is basically a surging idle problem, so I suggest you start with the Surging Idle Checklist.

 

[Boss 351]

thanks, I printed out that thread. I'll run through those suggestions